Hey all, So it would seem there's a crippling bug in the izanagi's burden questline if started post-Shadowkeep. Specifically, even when obtained in order, the first 3 keys do not unlock the 4th key mold, nor does doing Belerusia forge on max temper give the 4th key for the mystery box. Because we cannot obtain the 4th key for the box in any way, we're obviously totally locked out of obtaining the gun in Shadowkeep. Feel free to ask for any follow up info but the bug seems ubiquitous for players that skipped black armory dlc and doubled back for it post shadowkeep's release. Thanks.
same problem, have been waiting for over a week and even doing forges and bounties from ada every day